Giros is definitely a French name. It shows up frequently in the parish registers in the area of Belfort, France, from the 1500s. The name is also spelled Girol, Giroz, Gyrol, and even Giraud. In the United States it is sometimes spelled Gerot, and there is a large settlement of the family around the small town of Riverside, Iowa. My branch of the family is posted on Rootsweb.com World Connect Project.